[ARM] cputype: separate definitions, use them

Add asm/cputype.h, moving functions and definitions from asm/system.h
there.  Convert all users of 'processor_id' to the more efficient
read_cpuid_id() function.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-ixp4xx/include/mach/cpu.h

@@ -14,18 +14,19 @@
 #ifndef __ASM_ARCH_CPU_H__
 #define __ASM_ARCH_CPU_H__
 
-extern unsigned int processor_id;
+#include <asm/cputype.h>
+
 /* Processor id value in CP15 Register 0 */
 #define IXP425_PROCESSOR_ID_VALUE	0x690541c0
 #define IXP435_PROCESSOR_ID_VALUE	0x69054040
 #define IXP465_PROCESSOR_ID_VALUE	0x69054200
 #define IXP4XX_PROCESSOR_ID_MASK	0xfffffff0
 
-#define cpu_is_ixp42x()	((processor_id & IXP4XX_PROCESSOR_ID_MASK) == \
+#define cpu_is_ixp42x()	((read_cpuid_id() & IXP4XX_PROCESSOR_ID_MASK) == \
 			  IXP425_PROCESSOR_ID_VALUE)
-#define cpu_is_ixp43x()	((processor_id & IXP4XX_PROCESSOR_ID_MASK) == \
+#define cpu_is_ixp43x()	((read_cpuid_id() & IXP4XX_PROCESSOR_ID_MASK) == \
 			  IXP435_PROCESSOR_ID_VALUE)
-#define cpu_is_ixp46x()	((processor_id & IXP4XX_PROCESSOR_ID_MASK) == \
+#define cpu_is_ixp46x()	((read_cpuid_id() & IXP4XX_PROCESSOR_ID_MASK) == \
 			  IXP465_PROCESSOR_ID_VALUE)
 
 static inline u32 ixp4xx_read_feature_bits(void)